Which gland is both exocrine and endocrine?

Which of the following glands acts as both an endocrine and an exocrine gland?

Select the correct option for the following statements:
$(i)$ The pancreas is a $heterocrine$ / $endocrine$ gland.
$(ii)$ $Muscular$ $tissue$ / $Neural$ $tissue$ is a composite tissue.

Select the incorrect statement for $Glucagon$.

The element present in traces in insulin is:

The Islets of Langerhans are: